function PopUp(target,WindowName,mheight,mwidth)
{
    if (window.window1) window1.close;
    var window1 = window.open(target,WindowName,'scrollbars=yes,width='+mwidth+',height='+mheight+',top=10,left=10,resizable=yes');
    if (window1.opener == null) window1.opener = self;
    if (!window1.closed) window1.focus();
}